Spring创建Bean实例的三种方法

1、使用构造器

<bean id="personService" class="com.spring.service.PersonService"/>

2、使用静态工厂类

<bean id="personService" class="com.spring.service.PersonServiceBeanFactory" factory-method="createPersonService">//静态工厂类（由静态方法创建bean）public class PersonServiceBeanFactory {public static PersonService createPersonService(){return new PersonService();}}

3、使用实例化工厂

<bean id="personServiceFactroy" class="com.spring.service.PersonServiceFactory"/><bean id="personService3" factory-bean="personServiceFactroy" factory-method="createPersonServiceBean"/>//工厂类public class PersonServiceFactory {public PersonService createPersonServiceBean(){return new PersonService();}}